SP Page Builder No font installed Request failed with status code 429

Hello,
We are using SP Page Builder across our different environments (Localhost, DEV, PROD), and we want to upgrade to the latest version Version 6.6.2.
The download was successful and works properly in the localhost environment. We are able to use SP Page Builder correctly on localhost.
However, when we install it on the DEV server we encounter issues.
We are unable to access the administration page in the back office:
SP Page Builder → Pages
Instead, we get an error message on a blank page:
"No font installed
Request failed with status code 429"